Which eukaryotic organelle(s) contain its/their own DNA?
a. chloroplasts only
b. endoplasmic reticulum only
c. mitochondria only
d. mitochondria and chloroplasts
e. mitochondria and endoplasmic reticulum
ANSWER: d
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Most carbon dissolved in the ocean is in the form of
a. carbon dioxide. b. carbon monoxide. c. carbonic acid. d. bicarbonate and carbonate. e. carbon tetrachloride.
Which nucleotide is added to the end of a completed messenger RNA transcript?
a. adenine b. thymine c. cytosine d. guanine e. alternating adenine and thymine
Why can't amphibians be entirely terrestrial?
A) Their limbs are not adapted to support their bodies on land. B) They have a three-chambered heart that is not efficient enough for terrestrial life. C) Their digestion is adapted for consuming aquatic prey. D) Their reproduction requires water to allow fertilization and keep eggs moist. E) They do not have lungs but instead have gills that require water for gas exchange.
Could two phenotypically normal parents have an affected child?
a. Yes b. No